What is "incarceron"

Incarceron (2007) is a young-adult fantasy and science fiction novel written by Catherine Fisher that was first released on May 3, 2007. Published by Hodder Children's Books, it is the first in a line of novels centered on Finn and Claudia, two adolescents individually confined by the Warden of Incarceron. A sequel to the book, entitled Sapphique, was published in 2008. Incarceron was first released in the United States in 2010 and appeared on the New York Times children's bestseller list. 20th Century Fox owns the film rights to the novel. The book has been released in paperback and as an audio book, read by Kim Mai Guest.